// Copyright 2015 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'dart:math'; // This class represents a dot-separated version string. Used for comparing // versions. // Usage: assert(new Version('1.1.0') < new Version('1.2.1')); class Version { Version(String versionStr) : _parts = versionStr.split('.').map((val) => int.parse(val)).toList(); List<int> _parts; bool operator<(Version other) => _compare(other) < 0; bool operator==(dynamic other) => other is Version && _compare(other) == 0; bool operator>(Version other) => _compare(other) > 0; int _compare(Version other) { int length = min(_parts.length, other._parts.length); for (int i = 0; i < length; ++i) { if (_parts[i] < other._parts[i]) return -1; if (_parts[i] > other._parts[i]) return 1; } return _parts.length - other._parts.length; // results in 1.0 < 1.0.0 } int get hashCode => _parts.fold(373, (acc, part) => 37*acc + part); }